使用异常代替return null

git-svn-id: http://code.alibabatech.com/svn/druid/trunk@636 b9813039-fb51-4c41-a8b9-e21c2acb5095

src/main/java/com/alibaba/druid/pool/DruidDataSource.java

@@ -560,7 +560,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                 empty.signal(); // send signal to CreateThread create connection
 
                 if (estimate <= 0) {
-                    return null;
+                    throw new GetConnectionTimeoutException();
                 }
 
                 try {
@@ -580,7 +580,7 @@ public class DruidDataSource extends DruidAbstractDataSource implements DruidDat
                         continue;
                     }
 
-                    return null;
+                    throw new GetConnectionTimeoutException();
                 }
             }
 

src/main/java/com/alibaba/druid/pool/GetConnectionTimeoutException.java

@@ -0,0 +1,22 @@
+package com.alibaba.druid.pool;
+
+import java.sql.SQLException;
+
+
+public class GetConnectionTimeoutException extends SQLException {
+
+    private static final long serialVersionUID = 1L;
+
+    public GetConnectionTimeoutException(){
+        super();
+    }
+
+    public GetConnectionTimeoutException(String reason){
+        super(reason);
+    }
+
+    public GetConnectionTimeoutException(Throwable cause){
+        super(cause);
+    }
+
+}